Lifting jack



Dec. 4, 1934. J. cuRoK LIFTING JACK Filed July 29, 1951 2 Sheets-Sheet l Inventor f1 llomey Dec. 4, 1934. CURQK 1,982,642

LIFTING JACK Filed July 29, .1951 2 Sheets-Sheet 2 Inventor v flllomey Patented Dec. 4, 1934 y-umriao sr rss -PATENT OFFICE m-rme .mcx

mm cum, Chaplin, swarm. Canada 7 Application July 29, 1931,- Serial mi. 553,859

' 2 cam, ((21. 254-122) I The presentinvention relatm to new and useful improvements in lifting jacks, and more particularly it pertains to jacks especially adapted for use in connection with motor vehicles.

It is one of the'objects of the invention to provide a lifting jack which when not in use may be contracted'so as to occupy but comparatively a small amount of space.v

'It is a further object of the invention to provide a jack in which great lifting power can be obtained from the efiorts of a single person.

It .is a further object of the invention to provide a new andnovel construction in a jack base which construction permits of nesting of the base in order that the same will occupy but com- I paratively little space when the jack is not in use.

Other objects of the invention will appearas the nature thereof is, better understood, and for the acthe line 3-3 of Figure. 1,

Figure 4 is a horizontal sectional theline-i-QofFigurel, I

Figure 5 is a detail sectional view of a portion of the operating mechanism taken on the-line 5-5 of Figure 1, and: Figure 6 is a perspective view illustrating the operating handle by meansg io'f which the jack maybe op rated.

Referring more specificallly to the drawings,- the reference numeral 10 designates the base of the jack. 'As better illustrated in Figure 4, this.

base comprises three members 11, 12 and 13 each of which is relatively narrow, and which mem bers are of diiferent length in order that they may nest within one'another. The members 11, 12 and 13 which form the base may be connected together for pivotal movement relative to each other by means of a rivet, boltv or the like 14 as best illustrated in Figure 3, and when theiack is not in use, these members are adapted to be moved to position in alinement with each-other and when in use, they are adapted to be spread in a fan like manner as best illustrated in Figure} to form a firm base for the jack.

The member 11 is provided with spaced flanges or the like 15, and pivotally mounted between these flanges, there is a toggle mechanism 16,

view'taken on This toggle mechanism 16 comprises spaced sets of hnks 17 and thelinks of each set are arranged in corresponding pairs. Each pair of hnks is pivotally connected to the adjacent pair of in its own set and the corresponding pair of 00 hnks in the otherset by pins 18 or the like.

Carried by the toggle mechanism at a point intermediate of its ends and connected to one of the pivotal points between the links 1'1, there is a housing 19 which housing has a projection or 06 extension .20 which forms a bearing for a power screw or the like 21. The power screw 21 has threaded engagement with a threaded passage through a block 22 which is connected to the tog- .gle mechanism at a point directly opposite thepoint of connection of the housing 19 and said block 22 is pivotally connected to the toggle mechanism as is said housing 19. I

Thelinks 1'1 of the toggle mechanism are also pivotally connected. together where they cross one another as designated at 23 and at'the upper end of the toggle mechanism, certain axle or wheel engaging means such asshoes 24 are provided, the opposite end of the toggle mechanism providing the pivotal point 25 thereof betweenrgo the flanges 15 heretofore mentioned.

- Thus it will be apparent that as. the power screw 21 is rotated, thetoggle mechanism will be extended or retracted depending upon the direction of rotation of the power screw; and that by 5 extension of the; toggle mechanism an article which is engaged by the shoes 24 I thereof may be moved.

Means is provided for the power screw 21 and in the present embodiment of the invention, this means comprises a planet y gearing enclosed within the housing 19 heretofore mentioned. By reference to'Figure 2 it will be noted that the end or the power screw 21 is provided with an axially disposed recess 30. Mounted in recess'30 there is a pin or shaft 31 which car-r ries a gear 32 and projecting outwardly from said gear 32, the shaft is extended asat'33 and isprovided with a multiple side extension 34 the purpose of which will be hereinafter described. The extension 33 is mountedin a bearing 35 formed on the cover 36 of'the housing 19, and as best illustrated in Figure 2, this cover has threaded engagement with the housing in order that it may be removed if desired. The housing 19is provided with an internal gear 37 and meshing with the gear 32 =heretoforementioned and the'internal gear 37, there is a plurality of gears 38 in the, present illustration of the inventio three of V thesegearsaabeingshgwn. GearsB ed on-pintles carried by a suitable plate arranged within the housing 19 and keyed as at 40 to the dle as illustrated in Figure 6. The handle consists of a socketed head 41 adapted to receive the squared extension 34 of the shaft 33 and connected to the socketed member 41 by means of a universal joint 42 there is a rod or the like 43 which is pivotally connected as at 44 to a rod-or the like 45 which in turn is pivotally connected as at 46 to an operating handle 47. This operating means can be folded upon itself to occupy but comparatively small space but when in use,

it is-extended to the position shown in Figure 6 and thus permits of the jack being placed in an unhandy position and at the same time conveniently operated.

, Means is-provided to guide the toggle mechanism in its movement to and from extended posi tion, and in the present illustration of the invention this means consists of a pair or spaced standards or the like'50 which project vertically from the base and one of the pivots 23 is adapted to move into the space between the spaced standards 50 as best illustrated in Figure 2 of the drawingsa From the foregoing it will be apparent that the present invention provides a newand novel form of 'lifting jack which may be foldedinto a compact element when not in use, and yet which is capable of producing a high degree of lifting by Letters-Patent of the United States, is;

1. A lift jack comprising a base, a vertically movable toggle mechanism engageable at the top with an object to be acted uponand having at the bottom a pivotal connection with the base and screw means for opening and closing the toggle system comprising a horizontal screw and nut connections with links of the toggle spaced away fromand out of contact with the base and intermediate' the base and the top of the toggle system, said toggle mechanism comprising a pair of oppositely extending short links at the bottom with their inner ends pivoted to the base in a fixed position and forming the pivotal connection thereat, and a plurality of longer links crossing in pairs and pivoted together where they cross and pivoted at their outer ends to one another, the lowermost of the longer links being pivoted at their outer ends to the outer ends of said short links, and guide means extending from the base to said lowermost longer links where they cross and said'screw and nut devicebeing connected with the outer ends of longer links.

2. A lift jack as in claim 1 in which the guide means comprises an element attached to the base and having a vertical slot and a link-pivoting pin extending into such slot.

JULIUS CUROK. 

